Placing the ISDN Order Through Your Telephone Company A-6
Siemens EWSD Switch
To order ISDN service for the Siemens® EWSD switch, supply
the telephone company with the information provided in
Table A-5.
* The Directory Number, Circuit-switched Voice, and Circuit-switched Voice Limit
parameters should be set to 2 to allow both analog ports to be used simultaneously.
Otherwise, if those parameters are set to 1, the ISDN line can only place or receive one
call at a time.
†FCO (also referred to as Additional Call Offering) allows you to receive an incoming call
while a dual-channel Multilink PPP call is active. If you do not want this feature, which
may cost extra, FCO is not required.
Table A-5 Line Configuration for Siemens EWSD
Required Information Specification
Line Type Standard (2B+D) National ISDN-1 line
Line Code 2B1Q
Interface Type U interface with an RJ-45 jack
Directory Numbers 2*
Circuit-switched Data and Voice Yes
Bearer Restriction Option No packet mode data (NOPMD)
Protocol Functional
SPID Suffix 1
Terminal Endpoint Identifier (TEI) Dynamic
Key System (EKTS) No
Flexible Call Offering (FCO) Yes†